Module test_support 

Test fixtures. Made pub (rather than #[cfg(test)]) so the integration tests in tests/ can reach them — same pattern as compose::test_support and mailbox::test_support.

Structs

MockKeySender

Recording stub. Captures every (session, encoded) pair so tests can assert which session was targeted with which key. Separate scroll_calls log for mouse-wheel forwards so keystroke and scroll surfaces stay independently inspectable.